[TYPO3] Slow query
Martin.Kutschker at n0spam-blackbox.net
Thu Sep 28 09:18:47 CEST 2006
> My web hotel gave me an alert for a slow SQL query that took 16 seconds.
> When I ran the same question in PHPmyAdmin, it took 6 seconds, which is
> shorter but still pretty long.
> I guess the query came from macina-searchbox. How can I speed it up?
> Here's the query:
> SELECT IR.phash
> FROM index_words IW,
> index_rel IR,
> index_section ISEC
> IW.baseword LIKE '%Ã¤ngsholmmen%'
> AND IW.wid=IR.wid
> AND ISEC.phash = IR.phash
> AND ISEC.rl0 IN (130)
> AND is_stopword=0
> GROUP BY IR.phash;
Get rid of "column like '%term%'" constructs because it may not use an
index. That means you may only allow "begins with" ("like 'term%'") or "is
exactly" (= 'term') for your web users. But I don't think that the indexed
search really optimizes these cases.
Maybe it helps to use a MySQL specific full text index for "contains"
searches. But essentially that mould mean you would have to create a text
field with all (unqiue) words on the page to allow a Mysql full text index.
But of course this also has to be multiplied with the language/cHash/grlist
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